mcb

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  1. J

    RCD vs MCB...

    Does an MCB protect against fault current in the same way as an RCD does? As in, both devices trip by way of detecting imbalance in the Line conductors and thus using magnetism to sprag the switch? I ask, because if so, I can’t get my head round why an RCD is better than an MCB. I know that it...
  2. L

    No end to end 2 Radials on one MCB

    Hello, I have tried to search the forum but have not found anything although this must have been asked a thousand times. When completing a board change for example and there is no end to end on the neutral does downgrading the mcb to a 20amp and effectively running two radials from the same MCB...
  3. N

    Tripping mcb and rccb

    Hi guys. Just want some advice or thoughts from the pro's. So I'm an engineer who works on espresso machines. Going back a few months ago now I got called out to a machine tripping the power, in my line of work this generally means one loop on the heating element has shorted to ground or one...
  4. N

    Why would spike lights trip an MCB as if a dead short is present ?

    Just finished installing 20 x spike lights in a customers front garden. 2.5mm SWA ran from existing junction box feeding existing fence lights. All pulling no where near 1A in total. When all connected and wiring tested, went to switch on MCB and it popped. Rendering the MCB useless as if L-N...
    • NEB Electrical
    • Thread
    • dead lights mcb present short spike trip
    • Replies: 23
    • Forum: Lighting Forum
  5. J

    Electrician Jobs Looking for electrician to swap MCB in OL10 area.

    Hi. Im looking for electrician to swap mcb in my consumer unit for one suitable for single phase welder with max input current of 16A. In my consumer unit there is 32A type B mcb that was used with electric shower that is disconnected. I need it swapped for 16A type C (been told its a right...
    • JakubKot
    • Thread
    • area electrician looking mcb swap
    • Replies: 11
    • Forum: Electricians Jobs
  6. Z

    MCB trips ONLY when open in one go all lights together

    I have about 50 led spot lights + more light , all together is about 400w if I open them all in one go together, then the MCB [=6 am] trips immediately, but if I open them one by one I have no problems at all ! I tried to replace the MCB with another 6am and it did the same, but when i replace...
    • zwizwi
    • Thread
    • lights mcb together trips when
    • Replies: 4
    • Forum: The Welcome Forum
  7. J

    Selection of MCB for SPD protection

    Hello, I need to install a type 1+2 SPD into the main panel of a small business building, which needs lightning protection. The main breaker in the main panel is a 4 poles 40A MCB. I was looking for a SPD and I found this: Schneider A9L16634. In the technical specification sheet it says...
  8. buzzlightyear

    need max for old mcb

    any body got the max ohms for old dorma smith mcbs , I asked dorma smith years ago sent me max ohms for old load masters .
  9. F

    C50 MCB

    Does anyone know where I can get an old Crabtree C50 type MCB from?
  10. M

    Intermittent mcb trip electric gate

    Hi, just registered, I qualified in 1973 and and not done much electical work for the past 30 odd years but I obviously have grasp of the theory. I have an intermittent mcb tripping on my electric gate, which I installed. (All electric no hydraulics) The mcb will trip in any weather...
    • mickponte
    • Thread
    • electric intermittent mcb trip
    • Replies: 13
    • Forum: UK Electrical Forum
  11. newfutile

    6mm T&E on 40 amp mcb

    while doing EICRs i often find this combination, if its clipped direct it dont worry me however many times i have no idea how the cable is routed im just wondering how others would code this?
  12. K

    Need a different mcb

    Hi al it’s not. DIY job I’m aware of that. But I have just purchased an electric range cooker. Had an electrician out to extend cooker cable and he told me the instructions Manila of the cooker required a 40amp MCB. I’m not really in the market as of yet to be changing the consumer unit and I...
  13. Ashley-Joseph

    Spur from 32MCB

    Just wondering if I got this right but is it ok to take a 2.5mm spur from a 32MCB ring main Or should I use 4mm cable.
  14. coolsparx

    Old Crabtree Starbeaker MCB Compatibility

    Does anyone know if the current Crabtree 61/B32 Starbreaker 32A SP 6kA Type B MCB will fit the old board pictured?
  15. S

    Spur off a spur.... make safe with 16A MCB from ring?

    Just recently has some work done on a conservatory, and in the process discovered that the 2 double sockets are not part of a ring main... looks like one is a spur off the back of a ring socket in the main house, and the second is a spur off of that :eek: So, question is, if I replace the ring...
    • Sparked Out
    • Thread
    • 16a consumer unit mcb off ring safe spur
    • Replies: 6
    • Forum: DIY Electrical Advice
  16. J

    Wylex Stotz PSB 63A MCB

    Does anybody know where I can source an old style Wylex PSB 63A SP MCB? It's to fit an existing 3 Phase Distribution Board with fork style busbar. Thanks in advance.
  17. A

    Oven won’t work...unsure issue.

    Hello, My cooker (LOGIK LFTC60W16 oven with grill and 4 hobs had it maybe just over 2 years) stopped working about 2 weeks ago. I found out we have no cooker switch on the kitchen wall so checked the Circuit Breaker box. Everything was on. With no other option I left the cooker MCB switch in the...
    • Andrew Atchison
    • Thread
    • cooker fail fuse issue lights mcb oven
    • Replies: 27
    • Forum: DIY Electrical Advice
  18. T

    Cheap MCB lockout devices

    Had these arrive today, thought it was quite a bargain. 10x lockouts for £9.00 including VAT and delivery. Thought they maybe cheap n nasty, but pleasantly surprised. Can't knock em for the money. https://www.amazon.co.uk/dp/B07FDZNTG2?ref_=pe_3187911_264767211_E_301_dt_1
    • The Flyinhos
    • Thread
    • cheap devices lockout mcb
    • Replies: 17
    • Forum: UK Electrical Forum
  19. W

    Body’s resistance with mcb only

    If there’s 230v and the body’s resistance is high .. Meaning the current will be very low but enough to kill you. Can we get electrocuted without having a 30ma rcd to stop this as the 6amp breaker will not have tripped ?
  20. Marcus Vaughan

    Type C MCB needed for EV Charging?

    Hi all, I've not a lot of experience with EV but was called to a local job to investigate a loss of power to a 32amp 7.2KW EV charger. It turned out the 32A MCB (Type B) had failed, and would not even operate when completely removed from the board. I happened to have a matching Contactum B32...

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